Article Photos: Oklahoma coach Bob Stoops confirms Trevor Knight's knee injury; Blake Bell will start Saturday against Tulsa 56/61

Oklahoma's Corey Nelson (7) breaks up a pass intended for Cody Clay (88) during the second half of a college football game between the University of Oklahoma Sooners (OU) and the West Virginia University Mountaineers at Gaylord Family-Oklahoma Memorial Stadium in Norman, Okla., on Saturday, Sept. 7, 2013. Photo by Steve Sisney, The Oklahoman